English, asked by suzain4, 1 year ago

How are the earth's principal biological system being depleted

Answers

Answered by Anonymous
20
Mr. Lester R. Brown has pointed out that there are four principal biological systems of the earth.

They are
1. fisheries
2. forests
3.Grasslands
4.croplands


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☆ They supply our food and provide raw materials for industry except minerals. 

☆ But man’s demands on these systems are reaching an unsustainable level. Overfishing is very common.

☆ Local forests are disappearing to provide firewood and wood. The world is losing 40 to 50 million acres of forests a year. 





suzain4: thank u soo much
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